Looks very clean indeed. You have black detailing on the car, so black would keep it down to two colours. White just introduces a new colour. Have a look at Mr Worzel's car however, which shows you that white can work well with silver.
Good luck!!
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Toyobaru 86 with Cosworth exhaust brakes and supercharger, Cosworth mapping, Eibach lowering springs, OZ alloys, fast road geo and various cosmetics. Great fun!